> "Deleting data does not get rid of it unless you wipe the file."
>
> "Most wiping products do NOT work as advertised, and none of them really
> verify that the data was wiped."
Hmmm, don't know why - it's not that tough to do:
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#undef NULL
#define NULL (0)
char a[4];
main ()
{
char fn[255];
char lbuf[65535];
char lbuf2[65535];
int p, i, j, n, r;
char c;
a[0] = '\0';
a[1] = 0x0f;
a[2] = 0xf0;
a[3] = 0xff;
while (fgets (fn, 253, stdin) != (char *) NULL)
{
fn[strlen (fn) - 1] = NULL;
chmod (fn, 0622);
n = open (fn, O_RDWR);
if (n < 1)
{
perror (fn);
continue;
}
for (i = 0; i < 4; i++)
{
printf ("\rSecure wipe '%s', pass %d", fn, i + 1);
fflush (stdout);
for (j = 0; j < 65535; j++)
lbuf2[j] = a[i];
while (1)
{
if ((p = read (n, lbuf, 65530)) < 1)
break;
lseek (n, -1 * p, SEEK_CUR);
if (EOF == write (n, lbuf2, p))
{
perror ("write");
continue;
}
}
lseek (n, 0, SEEK_SET);
}
close (n);
unlink (fn);
puts ("");
}
}
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